[Rare case of the large-sized, unilateral incisive canal cyst].

A rare case of an extremely large, unilateral incisive canal cyst (nasopalatine duct cyst), located between the teeth #11 and #25 is presented. The upper border of the cyst extended to the nasal cavity, the posterior border was the maxillary sinus while the lower border was 5 mm above the maxillary alveolar process. The apices of the vital teeth 21, 22, 23 were in the cyst.